If your blog generates a good amount of page views
(e.g., 5,000 per day or more), regardless of where
the traffic is coming from, you could experiment
with CPM ads.
CPM stands for cost per mille, and it is a type of
online advertising where advertisers pay for every
1,000 impressions on their ads (in Latin mille means
thousand).
Here are some popular CPM advertising networks
that you could try:

• Technorati Media
• Tribal Fusion
• Burst Media
• ValueClick
• Casale Media

The most common CPM banner formats are the
728x90 leaderboard, the 300x250 rectangle and the
160x600 large skyscraper.
Usually networks pay a premium price if you display
the banners above the fold, so the trick to making
good money under CPM deals is to have a design
that supports all the three banners above the fold.
Above is a screenshot from PopCrunch.com, a
celebrity blog that uses this monetization strategy.
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